1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode)
{

    // mode = 1 set , mode = 0  reset
    if (mode == 1)
    {
        reg |= (1 << pos);
    }
    else
    {
        reg &= ~(1 << pos);
    }
    return reg;
}

int main() {
    unsigned char reg;
    int pos, mode;

    scanf("%hhu %d %d", &reg, &pos, &mode);

    unsigned char result = modifyBit(reg, pos, mode);
    printf("%u\n", result);

    return 0;
}